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Live flood monitor

Real-time river flooding
across America.

Live USGS streamgauge readings, FEMA flood zones, NWS flood watches and warnings, and historical context — one map, refreshed throughout the day. Built for flood researchers, emergency managers, and outdoor recreationists.

Last updated November 11, 2026 · 115 sensors live
Rivers above flood
38
Watersheds elevated
70
Active flood sensors
115
USGS gauges tracked
10K+
Layers
Flow vs. normal
< 50%
~ 100%
200%
500%+
Tiles © Mapbox · Data USGS, NOAA NWS, FEMA, NRCS · Click any feature for details · Multiple layers under your click aggregate into one popup.
Today's flood briefing

What's happening right now

An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.

November
11
2026
Flood report
# CRITICAL FLOODING EMERGENCY: Multiple U.S. Regions Face Catastrophic Water Levels

The United States is experiencing a widespread flooding crisis with multiple regions reporting catastrophic streamflow levels reaching over 600 times normal capacity. The most severe situation is unfolding in the Middle Nueces watershed near Corpus Christi and surrounding Texas communities, where flows have exploded to an unprecedented 672,917% of normal levels. West Matagorda Bay communities near the Texas coast are similarly devastated at 37,531% of normal, while the Bill Williams River region affecting Parker, Arizona has surged to 20,732% of normal capacity. Authorities are urging immediate evacuation in affected areas as these extreme conditions pose life-threatening dangers to residents.

Texas communities are bearing the brunt of this disaster, with the Llano River near Mason and Llano reaching flows of 30,000 cubic feet per second—more than 15,524% of normal—creating dangerous flash flooding conditions throughout the Hill Country. The South Llano near Junction is experiencing similar devastation at 4,511% of normal flow. Arizona is facing its own crisis as communities near Lake Havasu along the Bill Williams River confront massive flooding, while the Gila River near Yuma has reached 8,198% of normal capacity. The Lower Verde River affecting Camp Verde and Cottonwood is at 14,725% of normal, threatening homes and infrastructure with unprecedented water volumes.

The Midwest and Southwest are experiencing compounding emergencies. The Upper Sangamon River near Springfield, Illinois has surged to 3,721% of normal, while Iowa communities along the Skunk River face flows at 2,091% of normal near Ames and surrounding areas. In New Mexico, the Pecos headwaters affecting Santa Fe and Las Vegas are at 8,142% of normal, with the Rio Chama near Española reaching 1,774% of normal. The Little Colorado River near Winslow, Arizona presents extreme danger at 4,359% of normal flow. The Montezuma watershed in Colorado has reached an alarming 360,000% of normal capacity, creating catastrophic conditions near Cortez and Dolores. Residents in all affected areas should seek higher ground immediately, avoid all flooded roadways, and follow evacuation orders as conditions continue to deteriorate rapidly. Emergency services are overwhelmed, and additional federal disaster assistance may be forthcoming.
Right now

Rivers currently flooding or rising

Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.

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River Observed (cfs) Seasonal avg (cfs) vs. Normal
Sangamon River 253 7 ↑ 3721% of normal
Black Warrior River 233 703 33% of normal
Paskamanset River 275 28 ↑ 970% of normal
Suwannee River 12,800 10,000 128% of normal
Alamosa River 191 10 ↑ 1930% of normal
Middle Raccoon River 913 135 ↑ 676% of normal
Delaware River 1,790 189 ↑ 950% of normal
Black River 885 88 ↑ 1005% of normal
Llano River 30,000 193 ↑ 15524% of normal
Samish River 119 204 58% of normal
Florida River 831 30 ↑ 2763% of normal
Solomon River 413 15 ↑ 2717% of normal
Pecos River 873 36 ↑ 2439% of normal
Hillsborough River 581 82 ↑ 709% of normal
Wild Rice River 19 44 43% of normal
Piedra River 927 84 ↑ 1104% of normal
Cedar River 202 109 ↑ 185% of normal
Animas River 4,220 520 ↑ 812% of normal
Tombigbee River 5,374 10,377 52% of normal
Conejos River 1,015 98 ↑ 1033% of normal
Guadalupe River 296 45 ↑ 652% of normal
Little Colorado River 10,440 240 ↑ 4359% of normal
Teton River 401 25 ↑ 1627% of normal
Gila River 746 9 ↑ 8198% of normal
Iowa River 7,800 748 ↑ 1043% of normal
Bill Williams River 4,250 21 ↑ 20732% of normal
Raccoon River 1,310 193 ↑ 679% of normal
Straight River 542 87 ↑ 623% of normal
Chariton River 505 16 ↑ 3258% of normal
Withlacoochee River 366 48 ↑ 771% of normal
Minnesota River 437 64 ↑ 681% of normal
Uinta River 406 37 ↑ 1096% of normal
East Verde River 751 5 ↑ 14725% of normal
Peace River 6,172 536 ↑ 1151% of normal
Myakka River 625 103 ↑ 608% of normal
Thief River 642 79 ↑ 813% of normal
Blue Earth River 2,200 207 ↑ 1065% of normal
Little Fork River 3,720 290 ↑ 1283% of normal

38 rivers are running elevated right now. Create a free account to see the full list, follow your rivers, and get alerts.

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By basin

Watersheds running elevated

Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.

CSV FREE ACCOUNT
HUC8 code Watershed Observed (cfs) vs. Normal
h03160106 Middle Tombigbee-Lubbub 1,694 122%
h12100402 West Matagorda Bay 304 ↑ 37531%
h17110005 Upper Skagit 1,870 ↑ 632%
h12030108 Richland 466 ↑ 5210%
h17110002 Strait Of Georgia 119 58%
h13060001 Pecos Headwaters 390 ↑ 8142%
h12090204 Llano 30,000 ↑ 15524%
h10280201 Upper Chariton 505 ↑ 3258%
h15030204 Bill Williams 4,250 ↑ 20732%
h03110205 Lower Suwannee 12,800 128%
h13020102 Rio Chama 951 ↑ 1774%
h10030203 Marias 401 ↑ 1627%
h13070001 Lower Pecos-Red Bluff Reservoir 290 ↑ 2636%
h03100208 Withlacoochee 366 ↑ 771%
h01090001 Charles 312 ↑ 1031%
h07040002 Cannon 542 ↑ 623%
h12110105 Middle Nueces 3,230 ↑ 672917%
h14060003 Duchesne 406 ↑ 1096%
h03100205 Hillsborough 581 ↑ 709%
h03100101 Peace 13,935 ↑ 1374%
h03100102 Myakka 625 ↑ 608%
h07080105 South Skunk 484 ↑ 1956%
h07130006 Upper Sangamon 253 ↑ 3721%
h09030005 Little Fork 3,720 ↑ 1283%
h14080203 Montezuma 180 ↑ 360000%
h15070101 Lower Gila-Painted Rock Reservoir 746 ↑ 8198%
h15020018 Moenkopi Wash 5 ↑ 255%
h03080103 Lower St. Johns 118,689 82%
h07020012 Lower Minnesota 335 ↑ 1430%
h07020011 Le Sueur 2,070 ↑ 2654%
h03160201 Middle Tombigbee-Chickasaw 3,680 41%
h10270103 Delaware 1,790 ↑ 950%
h13010005 Conejos 1,257 ↑ 1141%
h15060203 Lower Verde 751 ↑ 14725%
h03080202 Cape Canaveral 980 ↑ 1376%
h03080203 Vero Beach 1,187 ↑ 895%
h07100009 Lower Des Moines 21,000 ↑ 933%
h03160113 Lower Black Warrior 233 33%
h15060101 Black 885 ↑ 1005%
h07100007 South Raccoon 913 ↑ 676%
h07100006 North Raccoon 1,310 ↑ 679%
h12090203 South Llano 2,950 ↑ 4511%
h10260015 Solomon 413 ↑ 2717%
h07080107 Skunk 438 ↑ 2091%
h07080207 Upper Iowa 393 ↑ 875%
h12100201 Upper Guadalupe 296 ↑ 652%
h02020004 Mohawk 534 ↑ 1613%
h13060011 Upper Pecos-Black 193 ↑ 965%
h03090102 Northern Okeechobee Inflow 366 ↑ 1030%
h03090103 Western Okeechobee Inflow 1,770 ↑ 957%
h03090101 Kissimmee 347 ↑ 798%
h03080101 Upper St. Johns 35,167 ↑ 343%
h09020105 Western Wild Rice 19 43%
h14080201 Lower San Juan-Four Corners 4,850 ↑ 675%
h15020016 Lower Little Colorado 10,440 ↑ 4359%
h03180002 Middle Pearl-Strong 435 ↑ 7909%
h12040104 Buffalo-San Jacinto 1,117 ↑ 1431%
h07120004 Des Plaines 232 100%
h07080208 Middle Iowa 8,580 ↑ 995%
h09020304 Thief 642 ↑ 813%
h01090002 Cape Cod 275 ↑ 970%
h14080102 Piedra 927 ↑ 1104%
h13010001 Rio Grande Headwaters 2,279 ↑ 663%
h13010002 Alamosa-Trinchera 3,201 ↑ 1416%
h13020211 Elephant Butte Reservoir 3,400 ↑ 601%
h07020009 Blue Earth 2,200 ↑ 1065%
h05130202 Lower Cumberland-Sycamore 4,860 ↑ 607%
h14080104 Animas 5,051 ↑ 919%
h07020001 Upper Minnesota 437 ↑ 681%
h14080101 Upper San Juan 3,150 ↑ 5801%

70 watersheds are running elevated. Create a free account to see every basin.

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Background

What causes river flooding

Flooding is rarely a single-cause event — multiple factors usually compound. The most common drivers across the U.S.

🌧

Heavy rainfall

Persistent rain saturates soils and overwhelms drainage networks. Tropical systems and atmospheric rivers are the worst culprits.

⛄

Rapid snowmelt

Spring melt pulses can deliver months of accumulated water in days — especially when warm rain falls on existing snowpack.

🧊

Ice jams

Breakup ice can block channels, forcing water to back up and inundate upstream banks. Common on northern rivers in early spring.

🌊

Storm surge

Coastal hurricanes push seawater inland. Surge combined with rainfall is the deadliest flood scenario in U.S. history.

🛡

Reservoir releases

Controlled dam releases can dramatically increase downstream flow. USACE and USBR publish release schedules, but conditions change fast.

🌌

Burn scars

Wildfire-stripped slopes can't absorb rainfall — even modest storms produce dangerous flash floods on burned watersheds for years afterward.

Safety

Flood preparedness checklist

Floodwaters rise faster than most people expect. The basics that save lives.

1
Never drive through floodwaterSix inches can stall a car; two feet floats most vehicles. Turn around — don't drown.
2
Monitor levels near youTrack the gauges upstream of your location. Snoflo's push alerts can ping you the moment a threshold is crossed.
3
Have an evacuation planKnow two routes out and where higher ground sits. If officials issue an evacuation order, leave — don't wait.
4
Move valuables upDocuments, electronics, and sentimentals to upper floors. Disconnect electrical at the main breaker if water enters the structure.
5
Trust official sourcesNWS warnings and local emergency management are the authoritative source. Snoflo data is informational; always cross-check.
6
After the water recedesDon't return until officials clear the area. Floodwater carries sewage, fuel, and downed power. Document damage before cleanup.
Frequently asked

Flood map & river monitoring FAQ

What does "percent of normal" mean?

The current flow at a gauge compared to its seasonal average for this date. 100% means flow is right at the historical norm. 200%+ means twice the typical flow — a strong indicator of flood conditions on small-to-medium rivers. Every gauge-level flow report shows its live percent-of-normal.

What's the difference between a flood watch and a flood warning?

Watch: conditions are favorable for flooding within the next 12–48 hours. Warning: flooding is happening or imminent. Both come from the National Weather Service. Snoflo overlays both as toggleable layers on the map above.

How often does Snoflo's data refresh?

USGS streamgauge readings update every 15 minutes; we re-pull every hour. NWS warning polygons update as the NWS issues them — usually within 5 minutes. FEMA flood zones are static (the National Flood Hazard Layer is updated quarterly).

What is the FEMA flood zone layer?

FEMA's National Flood Hazard Layer (NFHL) shows the 1%-annual-chance ("100-year") and 0.2%-annual-chance ("500-year") floodplains. These are based on long-term hydrologic modeling, not current conditions. Useful for property risk; not a real-time signal.

Can I get an alert when my local river floods?

Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 20 ft stage"), and you'll get a push the moment it crosses. Free with a Snoflo account.

Is Snoflo a substitute for official warnings?

No. Snoflo is informational. For life-safety decisions always follow guidance from local emergency management, the NWS, and law enforcement.

Stay ahead of the water

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